EP 0602279 A1 19940622 - Limiting amplifier for PSK receiver.
Title (en)
Limiting amplifier for PSK receiver.
Title (de)
Begrenzender Verstärker für PSK-Empfänger.
Title (fr)
Amplificateur limiteur pour récepteur PSK.
Publication
Application
Priority
EP 92203181 A 19921016
Abstract (en)
The present receiver includes a radiofrequency part (RF) coupled to a limiting amplifier (SL) which is in turn coupled to a demodulation means (DM) which recovers a digital signal from a received signal obtained by modulating a carrier signal with this digital signal. The limiting amplifier (SL) has an input-output characteristic which is substantially linear for smaller input signals and which strives with a decreasing gain towards a limit value for larger input signals. Due to this input-output characteristic smaller received signals are treated linearly upto the demodulation means (DM). The latter can therefore for these signals compensate for a specific spectrum shaping of the digital signal performed before the actual modulation. In this way the receiver will perform in a nearly optimal way resulting in low bit error rates. For larger received signals the limiting amplifier (SL) is non-linear and such compensation is consequently without effect resulting for these signals in a performance degradation. The latter however is acceptable because these signals are naturally demodulated with less errors. <IMAGE>
IPC 1-7
IPC 8 full level
H03G 11/08 (2006.01); H04B 1/10 (2006.01); H04B 1/26 (2006.01); H04L 27/233 (2006.01)
CPC (source: EP US)
H04L 27/233 (2013.01 - EP US)
Citation (search report)
- [X] US 4792991 A 19881220 - ENESS ORVILLE M [US]
- [A] 39th IEEE Vehicular Technology Conference, 1-3 May 1989, San Francisco, US; IEEE, New York, US, 1989; pages 83 - 94, Chia Liang Liu and Kamilo Feher: "Noncoherent detection of pi/4 - QPSK systems in a CCI - AWGN combined interference environment"
Designated contracting state (EPC)
AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
EP 0602279 A1 19940622; FI 934564 A0 19931015; FI 934564 A 19940417; JP H06204907 A 19940722; US 5703910 A 19971230
DOCDB simple family (application)
EP 92203181 A 19921016; FI 934564 A 19931015; JP 26022693 A 19931018; US 72717596 A 19960930